High School

Two elements X and Y combine in a gaseous state to form XY in the ratio of 1:35.5 by mass. The mass of Y which combines with 2 grams of X will be:

(a) 7.1 grams
(b) 3.55 grams
(c) 35.5 grams
(d) 71 grams

Answer :

Given that the mass ratio of elements X to Y in the compound XY is 1 : 35.5, it means:

1\,\text{g of }X \text{ combines with }35.5\,\text{g of }Y.

Hence, if we have 2\,\text{g of }X, then the mass of Y required will be:

2 \times 35.5 = 71\,\text{g}.

\boxed{71\,\text{g of } Y} will combine with 2\,\text{g of }X.

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